基于中国科学院近代物理研究所正在研制的兰州重离子治疗专用装置（HITFiL）的参数和指标,对从回旋加速器到同步加速器之间中能传输段的纵向束流匹配过程进行了模拟分析。根据主加速器的注入要求,在束运线上采用了散束器以降低束流动量分散,从理论上分析了中能传输段末端可能实现的最小动量分散和达到最小动量分散的条件,讨论了散束效果与初始动量分散、束团相宽和漂移长度的关系。并利用MathCAD程序对束团在束运线上的纵向运动进行了跟踪模拟,使用PBO-Lab程序进行了验算,得到了当散束器射频电压为102kV时,末端动量分散为最小值2.764×10-4。进一步提出了中能传输段的基本参数,也为下一步的优化设计提供了基础。
Based on the parameters of the Middle Energy Beam Transport（MEBT） of the Heavy Ion Therapy Facility in Lanzhou（HITFiL）,which is now under design and construction at the Institute of Modern Physics,Chinese Academy of Sciences（IMPCAS）,a debuncher will be used to reduce the momentum spread for the injection requirement of the synchrotron according to the injection demand of the synchorotron.Both analytical model and tracking simulation with MathCAD are used for the choice of debuncher＇s parameters.The conclusion shows that the effective cavity voltage of the debuncher is 102 kV and the minimum finial momentum spread is 2.764×10-4.
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